<!DOCTYPE html>
<html onselectstart='return false'>
<head>
	<meta charset="UTF-8">
	<meta name="Author" content="FengYu">
	<title>Tz-34-Js</title>
	<style>
		*{margin:0;padding:0;font-family: Microsoft YaHei,serif;}
		li{list-style: none;}

	</style>
</head>
<body>
    <script>
    	var a = 1;
    	//a += 5;// === a = a + 5
    	a %= 5; // === a = a % 5;
    	alert(a)


    </script>

</body>
</html>